AUTOMATIC OPERATION & HIGH SENSITIVITY: Just place it where you want to check for leaks, it will automatically help you find leaks, and once the three contactors have hit the water, it will alert you immediately. Easy to use. No buttons, no programming, you can use it when you buy it at home. MATERIAL: Made of ABS plastic, this alarm leak is robust and environmentally friendly. Low consumption. By helping you detect water leaks in your home, it also helps in energy conservation and environmental protection. You will not regret it when you buy it. A GOOD ASSISTANT IN LIFE: Water damage is one of the most common and costly problems for families. Even a small amount of water can cause serious problems for your family. When you detect even a small leak, the Water Leak Alarm will ring loudly and let you know you have a problem that needs immediate attention before it becomes a costly problem. 9V ALKALINE BATTERY: This product requires a 9V alkaline battery, but we don't have a battery when it is shipped, you need to buy it from a quality foreign friend, this battery usually can battery after 1 year. APPLICABLE AREA: This product is widely used in all potential flood spots - near bathrooms, basements, kitchens, boats, garages, etc. product with confidence, no operation is required, you just need to install the battery, put the product in the test location. White color Quantity delivered: 1 piece becomeveryrich